<?php
header ("Content-Type:text/html; charset= utf-8");
require_once ('config.php');
/*销毁session,代码来源于php帮助手册的example,先销毁session_cookie,再销毁session*/
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}
session_destroy();
header("location:index.php");